17672631901
domain: N
Appears in sequences
- List of primes p which are equal to a central binomial coefficient C(n,floor(n/2)) plus 1.at n=10A066749
- Number of congruence classes (epimorphisms/vertex partitionings induced by graph endomorphisms) of undirected cycles of even length: |C(C_{2*n})|.at n=18A112849
- Primes of the form (2*n)!/(2*(n!)^2)+1.at n=5A112864
- Number of set partitions of {1, 2, ..., 2*n} with sizes in {[n, n], [2n]}.at n=19A260878
- a(n) = Sum_{d|n} binomial(d+n-1,n).at n=18A343548
- a(n) = Sum_{d|n} (n/d)^(d-1) * binomial(d+n-1,n).at n=18A363663
- a(n) = Sum_{d|n} (n/d)^(n-n/d) * binomial(d+n-1,n).at n=18A363664
- a(n) = Sum_{d|n} binomial(2*d-1,d).at n=18A382503
- a(n) is the denominator of tanh(Sum_{k=1..n-1} artanh(k/n)), where artanh is the inverse hyperbolic tangent function.at n=18A383431